| Nitzschia plana W. Sm., 1853 |
| Nitzschia pseudodelicatissima Hasle, 1976 |
| Nitzschia pseudofonticola Hust., 1942 |
| Nitzschia pseudonana Hasle, 1974 |
| Nitzschia pseudoseriata Hasle, 1965 |
| Nitzschia pulcherrima (Grunow ex Killon) Grunow, 1878 |
| Nitzschia punctata (W. Sm.) Grunow, 1878 |
| Nitzschia punctata var. coarctata (Grunow) Hust. |
| Nitzschia pungens Grunow, 1882 |
| Nitzschia radicula Hust., 1942 |
| Nitzschia recta Hantzsch ex Rabenh., 1862 |
| Nitzschia rhopalodioides Hust., 1955 |
| Nitzschia romana Grunow, 1881 |
| Nitzschia romanoides Mangin, 1952 |
| Nitzschia scalaris (Ehrenb.) W. Sm., 1853 |
| Nitzschia scaligera Grunow, 1880 |
| Nitzschia semicostata Boyer, 1920 |
| Nitzschia seriata Cleve, 1883 |
| Nitzschia sicula (Castrac.) Hust., 1958 |
| Nitzschia sicula var. bicuneata (Grunow) Hasle, 1960 |